docs(headless commerce react samples): add products per page

[fbeaudoincoveo]

https://coveord.atlassian.net/browse/KIT-3436

[github-actions]

Pull Request Report

PR Title

✅ Title follows the conventional commit spec.

Live demo links

• Storybook

• Playwright report

Bundle Size

File	Old (kb)	New (kb)	Change (%)
case-assist	244.1	244.1	0
commerce	341.1	341.2	0
search	414	414	0
insight	391.7	391.8	0
product-listing	306.4	306.4	0
product-recommendation	210.4	210.4	0
recommendation	257.2	257.2	0
ssr	405.1	405.1	0
ssr-commerce	338.5	338.5	0

SSR Progress

Use case	SSR (#)	CSR (#)	Progress (%)
search	39	44	89
recommendation	0	4	0
product-recommendation	0	10	0
product-listing	0	13	0
case-assist	0	6	0
insight	0	27	0
commerce	0	15	0

Detailed logs

search : buildInteractiveResult
search : buildInteractiveInstantResult
search : buildInteractiveRecentResult
search : buildInteractiveCitation
search : buildGeneratedAnswer
recommendation : missing SSR support
product-recommendation : missing SSR support
product-listing : missing SSR support
case-assist : missing SSR support
insight : missing SSR support
commerce : missing SSR support